there. hello to robin at home. great to have amy robach here. and rachel smith is in for lara today. >>> and we have some chilling, new details about the gunman behind that horrifying shooting at the oregon mall. his ex-girlfriend is now speaking out, saying his behavior changed dramatically the week before the shooting. >>> we have video we couldn't stop watching. here is why. 10-month-old babies learning to swim, obviously, before they can walk. we sent our correspondent, lama hasan, to learn the secrets of the pool. blissful and wonderful. >>> and love listening to this right here. ♪ music can mean only one thing. jerry seinfeld is here this morning. >>> but right now, let's get to the news. >>> the chopper went down at north island air station as what's being described as a routine training session. all four crew members onboard did survive the crash. they were rushed to various local hospitals, though. the extent of their injuries remains unclear at this hour. we're not sure what caused the crash. we will have more details as they become available. >>> also this morning, a ma